First 100 shots all but 1 extracted, the 1 was left in the chamber. but every time it extracts, the brass comes straight back and hits brass deflector and falls to ground or bounces off to a 3 o'clock direction about 2 feet. Two new RRA bcg's in new rifles are doing the same thing. Changed buffer from standard RRA milspec m4 stock set, to custom heavy buffer, then to a H2 buffer. Both rifles do the same thing. both have blue inserts.